<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0,user-scalable=no">
    <title>移动端布局</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        div{
            width: 375px;
            height: 300px;
            background: red;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>